CHEMISTRY HIGH SCHOOL

Which formulas represent two polar molecules?(1) CO2 and HCl (3) H2O and HCl
(2) CO2 and CH4 (4) H2O and CH4

Answers

Answer 1
Answer: The correct answer is shown in option 3. Water and hydrochloric acid are polar molecules. These molecules are polar because of the presence of bonds that are partially ionic or polar covalent bonds. Other examples are hydrogen fluoride and ammonia. 

Related Questions

Within a single molecule of water, two hydrogen bonds are bonded to a single oxygen atom by_______.However when there are multiple water molecules, the partial negative charge at one end of a water molecule attracted to the partial ositive charge of another water molecule forms ____________.
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What is the total amount of heat required to vaporize 1.00 gram of H2O(g) at 100.0C and 1 atmosphere?(1) 4.18 J(2) 334 J(3) 373 J(4) 2260 J
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The ph of a 0.001 m hcl solution is closest to

a. 1
b. 7
c. 3
d. 10

Answers

C 3 is the answer because its right

In the reaction C + 02 - CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? O 18 g O 54 g O 72 g 0 90 g​

Answers

Mass of oxygen : 54 g

Further explanation

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

Reaction

\tt C+O_2\rightarrow CO_2

mass before reaction = mass after reaction

mass C + mass O₂= mass CO₂

\tt 18~g+mass~O_2=72~g\n\nmass~O_2=72-18=\boxed{\bold{54~g}}

The process of photosynthesis is essential in the oxygen/carbon dioxide cycle. Photosynthesis removes ______ from the atmosphere and produces and releases ______ into the atmosphere.A) glucose, oxygen
B) oxygen, glucose
C) carbon dioxide, oxygen
D) oxygen, carbon dioxide

Answers

Answer:

The answer is C) carbon dioxide, oxygen.

Explanation:

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

So lets eliminate some answers:

  • Photosynthesis removes oxygen from the atmosphere and produces and releases glucose into the atmosphere.

Oxygen can not convert itself to glucose and plants don't take in oxygen so this answer is automatically eliminated

  • Photosynthesis removes oxygen from the atmosphere and produces and releases carbon dioxide into the atmosphere.

Plants take in carbon dioxide and convert it to oxygen basically how humans breath but inverted, not the other way around.

  • Photosynthesis removes glucose from the atmosphere and produces and releases oxygen into the atmosphere.

Glucose naturally is not found in the atmosphere in the first place so if a plant were to survive is would have to be in a glucose enriched environment which is very uncommon meaning it would be very rare to be a living functional plant that can photosynthesize. So this is checked off the list!

So we are now left with one sentence that would make sense

  • Photosynthesis removes carbon dioxide from the atmosphere and produces and releases oxygen into the atmosphere.

Plants take in carbon dioxide meaning the first section of this answer is right and they release oxygen which is also correct therefore this statement is valid and is the correct answer

Hope this helped (:

Sources I used:

  • Oxford dictionary

Which of the following can effect the resistance of a wire?I. the length of a wire
II. the thickness of a wire
III. the temperature of a wire
I and II
I and III
II and III
I, II, and III

Answers

Answer:

l and lll

Explanation:

The longer the wire, the more resistance that there will be and heating a metal conductor makes it more difficult for electricity to flow through it.

when a log of wood burns, it undergoes a _______. a. physical change. b. chemical change. c. physical and a chemical change. d. no physical or chemical change.

Answers

B. Chemical change is the answer!

B. chemical change because a new substance is forming with new properties.

if 1200 j of heat were absorbed by a 25 g block of iron, by how much would the temperature of the iron increase?

Answers

m = mass of the block of iron = 25 g

Q = heat absorbed by the block of iron = 1200 J

ΔT = increase in the temperature of iron due to heat absorbed = ?

c = specific heat of block of iron = 0.450 J/(g C)

Heat absorbed by the block of iron is given as

Q = m c ΔT

inserting the values in the above formula

1200 = 25 (0.450) ΔT

1200 = (11.25) ΔT

ΔT = 1200/11.25

ΔT = 106.67 C
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